Luminous Flourescent Green Flying CrossWhile driving westbound on 45th Street, near the intersection of Stanley Road, I noticed a fluorescent green object in the sky to my WNW, at an elevation of approximately 45 degrees above the horizon. At first it had a tube shape and I thought it was an airplane flying at me. I realized it was not a single sidelight, but a solid mass of light. Then the object made a sharp turn to the north and then immediately turned vertically. It had the shape of a "bird" or upside down cross, as there was no tail. However, it was twilight and glowed a bright fluorescent green with orange around the entire edge. Suddenly, it was gone. Logic left me as I realized it was NOT an airplane nor bird.I proceeded to Shawnee Heights Road, scanning the sky outside of my windows, trying to rationalize what I had just seen. I then continued to the roundabout at Croco Rd. and looped around until heading eastbound. I pulled over near the transformers, just east of the roundabout. Now I noticed a jet, with flashing wing lights and landing light, circling the aforementioned location of the object. This plane circled 3 times before moving off in a northerly direction.I continued into Topeka, where I heard and saw a plane flying over, towards the West. I am not sure if this was the same jet, or another.